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L . Battenf i e l d ( E d . ) , Proceedings of the national I n t e r d i s c i p l i n a r y biological control conference. 15-17 Feb. 1983. , CSRS/USDA, Washington, DC. , and R. Baker. 1970. Rhlzosphere competition in model s o i l systems. PhytopathoIogy 60:1058-1061. E. 1951. The destruction of ArmiI I a r i a me I lea in c i t r u s s o i l s . Phytopathology 41:665-683. L. M i l l a r and B. Cunfer. 1969. Significance of a n t i b i o t i c p r o duction by Cephalosporlum gramlneum t o i t s saprophytic s u r v i v a l .

S. agriculture. DISCUSSION LEADER: D. Gonzalez Several questions were discussed: 1) Is biological control a cornerstone of IPM? If yes, then why has it received so little funding In recent IPM programs? S. S. Agriculture 51 to be measured principally by yields and reduction In pounds of insecticlde(s) applied? This may be acceptable on a short term basis, but what of the long term stability of IPM systems? There Is merit to the concept that pest mortality as caused by natural enemies should be a basis for IPM strategies, with chemicals being supplementary rather than primary mortality factors.

1951. The destruction of ArmiI I a r i a me I lea in c i t r u s s o i l s . Phytopathology 41:665-683. L. M i l l a r and B. Cunfer. 1969. Significance of a n t i b i o t i c p r o duction by Cephalosporlum gramlneum t o i t s saprophytic s u r v i v a l . Can. J . Plant S e i . 49:235-246. E. D. W. Barker. 1972. Counteracting bean root r o t by loosening the s o i l . Phytopathojogy 62:306-309. Chet, I . E. Harman and R. Baker. 1981. Trichoderma hamatum: I t s hyphal I n t e r actions with ^h^zo£lOnj^^pjanj_ and £yJt]_Ujm_ spp.

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